OPENINGS IN TAMILNADU

When a magnetic field cuts through metal, a current is induced. If a magnetic field cuts a wire in a closed circuit, a current is induced round the circuit. However if a magnetic field cuts through a sample of metal that is not connected to a circuit, an 'Eddy Current' is produced. This Eddy Current is localised in the metal, and has a flow pattern. The flow pattern is disturbed by discontinuities from the surface to a shallow depth of penetration. The method is quick and very sensitive. No contact with the metal is required. All metals may be subject to this form of testing.

We can provide Eddy Current training suitable for PCN/EN473/ISO 9712 Levels 1, 2, and 3, and ASNT Level 3. Alternatively we can provide training suitable for candidates working to an employer written practice based on SNT-TC-1A; EN4179 and NAS410. Eddy Current Testing is separated into three specific product sectors for certification purposes: Welds, Wrought Products (Forgings), and Tubes.

Below is an example of a syllabus that is used for Eddy Current training courses (we can make changes to a syllabus to satisfy the requirements of a specific written practice if necessary):

Level I

General Theory:

Brief History of Testing

Basic Principles of Testing

Generation of Eddy Currents by means of an AC field

Effect of fields created by Eddy Currents

Effect of change of impedance on instrumentation

Terminology and units

Principles of magnetisation.

Magnetisation

electromagnetism theory

Flux leakage theory and principle

Readout Mechanism

Types of Eddy Current Sensing Elements

Types of Flux Leakage Sensing Elements

Safety as applicable to Eddy Current Testing and Electrical Safety

Specific Theory:

Application of the Method and use of Codes, Specifications and Procedures, applicable to the Company, including the relevant control checks.

Level II

General Theory:

Review of Electromagnetic Theory

Factors that affect Coil Impedance

Factors that affect Flux Leakage Fields

Signal-to-Noise Ratio

Selection of Test Frequency

Selection of Method of Magnetisation for Flux

Leakage Testing

Coupling

Field Strength and Its Selection

Field Orientation for Flux Leakage Testing

Instrument Design Consideration

Safety as applicable to Eddy Current Testing and Electrical Safety

General Theory:

Application of the Method to the Specific requirements of the Company, in particular making reference to those Codes, Specifications and Procedures used by the Company, including the relevant control checks.